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تشنغتشو ، الصين

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bacfill materials crushed rocks mm

Recycling of crushed waste rock as backfilling material

Crushed waste rocks can be used as materials for backfilling goafs, so as to achieve the simultaneous goals of processing By using the stepwise loading method, the behaviours of the creep compression of waste rocks for backfill were tested by considering only the influence of Testing and modelling creep compression of waste rocks

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Microstructure and mechanical behavior of cemented gold

Effect of crushed rock content on fill's strength: (a) control group; (b) a crushed rock gradation of 1–3 mm; (c) a crushed rock gradation of 3–5 mm; and (d) a To investigate the behaviours of the creep compression of waste rocks used for backfill, a load testing system for granular backfill materials is developed in Testing and modelling creep compression of waste rocks

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Recycling of crushed waste rock as backfilling material in

Crushed waste rocks can be used as materials for backfilling goafs, so as to achieve the simultaneous goals of processing solid waste and controlling surface subsidence; Microstructure and strength behavior of cementitious tailings-crushed rock backfill (CTCRB) with gold/tungsten tailings and rock contents (e.g., 10%, 20%, 30%, Microstructure and mechanical behavior of cemented gold

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Samples of crushed waste rocks with different particle

Weijian Song Deon Germain Crushed waste rocks can be used as materials for backfilling goafs, so as to achieve the simultaneous goals of processing solid waste and controlling surface...The filling slurry with waste rock of d≤5 mm + pressed tailings obtains the maximum backfill strength, and other types of slurry have lower strength, so the strength Optimized mix ratio of crushed waste rocks in cementing backfill

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Applied Sciences Free Full-Text Effects of Loading

Coal mine waste rocks, mainly broken gangue, can be used as filling materials to backfill into goafs. Under the overburden load, the backfill body is vulnerable to compressive deformation and particle The assorted proportions of the waste rocks fractured within the backfill is also critical for the structural integrity of backfilling (Cheng et al., 2022; Yan et al., 2022a; Hou et al., 2022). Overall, Fig. 1 indicates that there were three main gradations of crushed rock materials: 1–3 mm, 3–5 mm, and 5–7 mm.Microstructure and mechanical behavior of cemented gold

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Recycling of crushed waste rock as backfilling material in coal mine

Crushed waste rocks can be used as materials for backfilling goafs, so as to achieve the simultaneous goals of processing solid waste and controlling surface subsidence; however, particle size distribution directly affects the compaction of crushed waste rocks. Therefore, by employing a self-designed bidirectional loading test system Backfill materials that are commonly used are described below with their engineering properties. 1. Coarse-grained soils. Coarse-grained soils include gravelly and sandy soils and range from clayey 6 TYPES OF BACKFILL MATERIALS USED IN

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Breakage law and fractal characteristics of broken coal and rock

Moreover, the backfill materials with different mixing ratios exhibited different degrees of breakage and deformation during the compaction, leading to different effects of backfill mining on the control over the surface subsidence. 16-18 Overall, investigating the compaction characteristics and the law of particle breakage of coal and In this study, single-particle crushing tests were carried out on rockfill materials with nominal particle diameters of 2.5 mm, 5 mm and 10 mm to investigate the particle size effect on the singleInfluence of Particle Size Distribution on Fractal ResearchGate

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Drainage Assignment TABLE OF CONTENTS SECTION S:

2.2.1 Jagged surfaces of rocks at the bottom of the excavation due to the trimming shall be levelled and smoothened with sand The maximum particle size of the backfill material shall be 50 mm. 3.1.3 Materials from swamps, peats or top soils and other highly 3.1.4 Granular backfill material shall be sand, crushed stone,backfill materials that can be tested in the laboratory, they were crushed by using a stone crusher machine. These materials originate from the eruption of Mount Kelud in 2014.Potential use of crushed pyroclastic rocks from mount Kelud as

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Effects of particle size of crushed gangue backfill materials on

As crushed materials are used to backfill goafs, The geological core log of the surrounding rocks indicates that the immediate roof of the panel is shale with an average thickness of 5.3 m, backfill materials graded to 2.5–50 mm were poured into the 13,080 backfill panel,The water seepage flow tests of the crushed KAS rocks showed that their seepage properties are controlled by their degree of compaction, particle size range, sample arrangement pattern, and initial pore structure, which explains the mechanism of the backfill mining-induced seepage effect and indicated the feasibility of reconstructing the KAS The Mining-Induced Seepage Effect and Reconstruction of Key

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Applied Sciences Free Full-Text Effects of Loading Stress MDPI

Coal mine waste rocks, mainly broken gangue, can be used as filling materials to backfill into goafs. Under the overburden load, the backfill body is vulnerable to compressive deformation and particle breakage. With the increase in mining depth, the overlying strata will impose different loads on waste rock filling materials at different Two main steps were used for crushing: waste rocks were manually hammer-crushed to 50 mm down; then, to ensure uniformity of the blocks of crushed waste rocks, A loading test system for granular backfill materials was developed in this study. It consisted of four key parts: an axial loading system, a loading box,Testing and modelling creep compression of waste rocks for backfill

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Applied Sciences Free Full-Text Effects of Loading Stress and

Coal mine waste rocks, mainly broken gangue, can be used as filling materials to backfill into goafs. Under the overburden load, the backfill body is vulnerable to compressive deformation and particle breakage. With the increase in mining depth, the overlying strata will impose different loads on waste rock filling materials at different To avoid such problems, one may try to perform in situ tests to directly obtain the field rockfill shear strength [51–59].Goodrich [] conducted in situ direct shear tests using a 300 mm × 300 mm shear Determination of the Shear Strength of Rockfill from

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Characterizations of macroscopic deformation and particle crushing

Broken waste rock as backfill materials is filled into the underground goaf and will encounter particle breakage under the overburden pressure. The damage degree of the crushed waste rock materials directly affects the compression properties of the backfill body and the control effect of strata movement and surface subsidence.However, crushed waste rock forms a granular medium, which in essence is a discontinuous medium. Under the effects of the overlying strata, they show completely different behaviours of creep compression with binder backfill materials and backfill materials with high water content. Moreover, strain hardening is found in their creep Testing and modelling creep compression of waste rocks for backfill

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Multi-Objective Function Optimization of Cemented

(FBRM) is shown in Figure 1. The full-size waste rocks from mine waste dumps were crushed to º5 mm (Table 1). The particle size distribution of crushed waste rock measured by the screening method is shown in Figure 2. Table 1. Physical parameters of neutralization slagoÁ Aggregate Density/(gcmº3) Dense unit weight/(gcmº3) PorosityThe mechanical strength properties of cemented tailings backfill are very important for the safe and environmentally friendly mining of mineral resources. To check the impact of polypropylene fiber on strength and microstructure of cementitious tailings waste rock fill (CTWRF), diverse fiber lengths (6 and 12 mm) and dosages (0-control specimen, Minerals Free Full-Text Effect of Content and Length of MDPI

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Samples of crushed waste rocks with different particle size...

Samples of crushed waste rocks with different particle size distributions. a 0–5 mm. b 5–10 mm. c 10–15 mm. d 15–20 mm. e 20–25 mm. f 25–30 mm Source publication +5before and after compression. Hane et al. [21] used gangue materials with three sizes (0~10, 0~15 and 0~20 mm) as the aggregates to prepare paste ﬁlling materials. They analysed deformation characteristics through unconﬁned compression tests and found that the waste rocks with a particle size of 0~15 mm, as aggregates of Effects of Loading Stress and Velocity on Compression and Particle

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Recycling of crushed waste rock as backfilling material in

Crushed waste rocks can be used as materials for backfilling goafs, so as to achieve the simultaneous goals of processing solid waste and controlling surface subsidence; however, particle size distribution directly affects the compaction of crushed waste rocks. Therefore, by employing a self-designe

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